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chainquery getmempoolentry
x402
chainquery getmempoolentry is a paid API for AI agents from x402.chainquery.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).
Returns mempool entry details for a specific unconfirmed Bitcoin transaction, including fees, size, and ancestor/descendant counts, via chainquery's independent Bitcoin Core full node.
Price / call$0.005
Success—
StatusUnknown
How this service works
chainquery Bitcoin RPC: pay-per-call Bitcoin Core over x402, no API key. Mempool details for a transaction from chainquery's independent full node: fees, size, ancestor and descendant counts. Bitcoin Core getmempoolentry.
Output
Returns the Bitcoin Core getmempoolentry result object for the specified txid, including fee amounts (base fee, modified fee), virtual size in vBytes, transaction weight, time the tx entered the mempool, ancestor count and fees, descendant count and fees, and whether the transaction is BIP125 replaceable.
Example use cases
Check fee rate for pending transaction
“I have an unconfirmed Bitcoin transaction with txid a1b2c3d4e5f6... — can you tell me what fee rate it's paying and how big it is in vBytes? I want to know if it's likely to confirm soon.”
Verify ancestor package size
“For Bitcoin transaction 3b96e5c1d2f7a8e9b0c4d6f1a2e3b4c5d6f7e8a9b0c1d2e3f4a5b6c7d8e9f0a1, how many ancestor transactions does it have in the mempool, and what's the total ancestor fee? I need to understand the full package before deciding whether to CPFP it.”
Cross-check mempool data independently
“Can you pull the mempool entry for txid 9f2e1d3c4b5a6f7e8d9c0b1a2f3e4d5c6b7a8f9e0d1c2b3a4f5e6d7c8b9a0f1 from an independent Bitcoin full node? I want to compare the fees and size against what my wallet is showing me.”
Technical details
Endpoint
GEThttps://x402.chainquery.com/v1/rpc/getmempoolentry?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need detailed mempool metadata for a specific unconfirmed Bitcoin transaction — especially fees, fee rate, size, and ancestor/descendant package data — without needing a persistent API key. Ideal for pay-per-call use cases where you query mempool data infrequently and want to avoid subscription overhead. Prefer over public mempool APIs when you need data from an independent full node for verification or redundancy.
Side effects
- Transaction not found in mempool (txid already confirmed or was never broadcast): RPC error result
- Invalid or malformed txid parameter: RPC error or 400 response
- Payment failure or insufficient USDC balance via x402: 402 Payment Required
- Malformed params JSON array: RPC parse error
- Node temporarily unavailable: 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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